Skilled in assuming any kind of mask and in playing every sort of part, Derues did not find it difficult to overcome Monsieur de Lamotte’s prejudices, and in order to obtain the goodwill of the father he made a skilful use of the friendship which the, son had formed with him. One can hardly think that he already meditated the crime which he carried out later; one prefers to believe that these atrocious plots were not invented so long beforehand. But he was already a prey to the idea, and nothing henceforth could turn him from it. By what route he should arrive at the distant goal which his greed foresaw, he knew not as yet, but he had said to himself, “One day this property shall be mine.” It was the death-warrant of those who owned it. We have no details, no information as to Derues’ first visit to Buisson-Souef, but when he departed he had obtained the complete confidence of the family, and a regular correspondence was carried on between him and the Lamottes. It was thus that he was able to exercise his talent of forgery, and succeeded in imitating the writing of this unfortunate lady so as to be able even to deceive her husband. Several months passed, and none of the hopes which Derues had inspired were realised; a loan was always on the point of being arranged, and regularly failed because of some unforeseen circumstance. These pretended negotiations were managed by Derues with so much skill and cunning that instead of being suspected, he was pitied for having so much useless trouble. Meanwhile, Monsieur de Lamotte’s money difficulties increased, and the sale of Buisson-Souef became inevitable. Derues offered himself as a purchaser, and actually acquired the property by private contract, dated December, 1775. It was agreed between the parties that the purchase-money of one hundred and thirty thousand livres should not be paid until 1776, in order to allow Derues to collect the various sums at his disposal. It was an important purchase, which, he said, he only made on account of his interest in Monsieur de Lamotte, and his wish to put an end to the latter’s difficulties.